Posted by **sara** on Wednesday, December 1, 2010 at 12:47pm.

You are given the following information obtained from a random sample of 4 observations.

25 47 32 56

At a .05 level of significance, determine whether or not the mean of the population from which this sample was taken is significantly different from 48. (Assume the population is normally distributed.)

- stats -
**PsyDAG**, Thursday, December 2, 2010 at 4:08pm
Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

## Answer This Question

## Related Questions

- statistik - Below are random sample of 4 observations. 25,75,32,56 Based on the ...
- Stats - I just need help with starting how to calculate the problem I am so lost...
- math - sample of 40 observations is selected from one population with a ...
- statistics - A sample of 40 observations is selected from one approximately ...
- statistics - A sample of 40 observations is selected from one approximately ...
- statistics - A management consultant has analysed a random sample of 40 large ...
- statistica - A management consultant has analysed a random sample of 40 large ...
- STATS - Suppose we are testing the null hypothesis H0: ì = 20 and the ...
- math/stats - A sample of 50 items is selected to determine whether or not to ...
- Stats - Recently, an automobile insurance company performed a study of a random ...

More Related Questions